Abstract
We propose and demonstrate a reconfigurable all-optical format conversion
from optical time-division multiplexing (OTDM) to wavelength division
multiplexing (WDM) providing full flexibility in terms of channel spacing
and wavelength allocation. The system consists of a Raman
amplification-based multiwavelength pulse compressor and a parametric
sampling gate. Four conventionally generated WDM 10 GHz pulse trains are
compressed at the same time to around 2.5 ps and, then, used for
multiwavelength sampling of a 40 Gb/s 3.49 ps OTDM signal. Simultaneous
extraction of all four 10 Gb/s tributaries to WDM channels in WDM grid with
tunable channel spacing is demonstrated. Controlling time delays among the
WDM clock channels makes it flexible to map OTDM tributaries onto any
desired wavelength order, which is also called wavelength- and
time-selective function. The reconfigurable functions can be realized
independently on the coming OTDM signal by simply setting corresponding
parameters of the WDM synchronous pulse trains at the terminals. This is
also the key for the good overall performance obtained for all demultiplexed
channels. Low power penalties below 1.9 and 2.1 dB are achieved with small
penalty variations, 0.3 and 0.5 dB, among channels as the OTDM tributaries
are converted to WDM grid with spacing of 400 and 200GHz,
respectively.
© 2012 IEEE
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